 /*
   * Copyright 2012 The Netty Project
   *
   * The Netty Project licenses this file to you under the Apache License,
   * version 2.0 (the "License"); you may not use this file except in compliance
   * with the License. You may obtain a copy of the License at:
   *
   *   https://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
 package com.rs.caht.netty.websocket.officialdemo;
  
  import io.netty.bootstrap.ServerBootstrap;
  import io.netty.channel.Channel;
  import io.netty.channel.EventLoopGroup;
  import io.netty.channel.nio.NioEventLoopGroup;
  import io.netty.channel.socket.nio.NioServerSocketChannel;
  import io.netty.handler.logging.LogLevel;
  import io.netty.handler.logging.LoggingHandler;
  import io.netty.handler.ssl.SslContext;
  import io.netty.handler.ssl.SslContextBuilder;
  import io.netty.handler.ssl.util.SelfSignedCertificate;
  
  /**
   * An HTTP server which serves Web Socket requests at:
   *
   * http://localhost:8080/websocket
   *
   * Open your browser at <a href="http://localhost:8080/">http://localhost:8080/</a>, then the demo page will be loaded
   * and a Web Socket connection will be made automatically.
   *
   * This server illustrates support for the different web socket specification versions and will work with:
   *
   * <ul>
   * <li>Safari 5+ (draft-ietf-hybi-thewebsocketprotocol-00)
   * <li>Chrome 6-13 (draft-ietf-hybi-thewebsocketprotocol-00)
   * <li>Chrome 14+ (draft-ietf-hybi-thewebsocketprotocol-10)
   * <li>Chrome 16+ (RFC 6455 aka draft-ietf-hybi-thewebsocketprotocol-17)
   * <li>Firefox 7+ (draft-ietf-hybi-thewebsocketprotocol-10)
   * <li>Firefox 11+ (RFC 6455 aka draft-ietf-hybi-thewebsocketprotocol-17)
   * </ul>
   */
  //netty官方demo
  public final class WebSocketServer {
  
      static final boolean SSL = System.getProperty("ssl") != null;
      static final int PORT = Integer.parseInt(System.getProperty("port", SSL? "8443" : "8080"));
  
      public static void main(String[] args) throws Exception {
          // Configure SSL.
          final SslContext sslCtx;
          if (SSL) {
              SelfSignedCertificate ssc = new SelfSignedCertificate();
              sslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey()).build();
          } else {
              sslCtx = null;
          }
  
          EventLoopGroup bossGroup = new NioEventLoopGroup(1);
          EventLoopGroup workerGroup = new NioEventLoopGroup();
          try {
              ServerBootstrap b = new ServerBootstrap();
              b.group(bossGroup, workerGroup)
               .channel(NioServerSocketChannel.class)
               .handler(new LoggingHandler(LogLevel.INFO))
               .childHandler(new WebSocketServerInitializer(sslCtx));
  
              Channel ch = b.bind(PORT).sync().channel();
  
              System.out.println("Open your web browser and navigate to " +
                      (SSL? "https" : "http") + "://127.0.0.1:" + PORT + '/');
  
              ch.closeFuture().sync();
          } finally {
              bossGroup.shutdownGracefully();
              workerGroup.shutdownGracefully();
          }
      }
  }